Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab01366ab3003c1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-28 18:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f1ad02e21ddf8276f448a6923e0a083 SHA-1: ef7d01127a9d84ca570e10884f83bfecec9682b9 SHA-256: eab01366ab3003c17976f194d06852130b080ecb1ac0ede4160eb884e49ecb09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=after+we+fell+online+free+movie PDF link annotation
    • http://vietsaovang.com/uploads/userfiles/file/13589342944.pdfIn PDF document text
    • http://tzsunup.com/upload/6326756415.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/nawevumak.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/kotopuvabezasefom.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/90718767501.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/totazigafaxuzidet.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/13001562065.pdfIn PDF document text
    • https://sitarasign.ir/data/file/54435841591.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rotefujotebilolukomerab.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/69117679660.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109240309193700.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/mabogititekejugex.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/89727587997.pdfIn PDF document text
    • http://gerocuki.hu/user/file/xeged.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/29130608421.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/runag.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/26760585688.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nqk18kvk71cnsn32p15ujpv304/lomoniritemapelunepevexam.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/92022729796.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/luruxuxozukowatigufo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/189fd10d4bb34f960551aa578685ecfa/95588601261.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/13109801364.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613586d790b19---40152697914.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/kibemewelolepo.pdfIn PDF document text
    • http://sswjeans.com/files/xalopiviv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 10180 bytes
SHA-256: 59dacc855025f62edb44983700e021ec0b55e24754b3508551177e286858b5ea
font_01_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16756 bytes
SHA-256: cce7e6a69d7f5add26adf94871746162dd3ff70ad2793b17004bd15fdbe87384
font_02_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1